Cocoon 3 monitoring

Nowadays, the reliability of web applications is very important. The best way to detect failures early is to monitor. Adding the monitoring feature to Cocoon 3 gives developers and administrators a great tool for detecting errors and failures. Using JMX enables us to:
* automatically inform about the occurrence of problems (via notification mechanisms)
* collect statistics about the system (eg. load and connections)
* inspect: the actual state of cache, settings and perform certain operations